Walnuts to Relieve Exam Stress

A new study may shed light on why some people gain more weight than others regardless of diet and activity levels. Led by researchers at the University of Copenhagen and published in the journal Microbiome, the study found that being overweight may also be related to the makeup of a person’s gut microbiome. The researchers studied 85 overweight adults and found that 40 percent of the participants had more Bacteroides in their gut microbiome, which are more effective at extracting nutrients from food, possibly causing leftover food to be stored as fat. Before they began their study, the researchers had hypothesized that a long digestive travel time would allow people to extract more energy from their food, but they found instead that people with shorter digestive travel times were actually the ones that extracted the most nutrition. Those with Bacteroides had shorter intestinal transit times and higher body weight.

Human-Grade Dog Foods Lead to Less Poop

Although human-grade foods for pets are commercially available, little research has been done on their health impacts. A 2021 study published in the Journal of Animal Science compared the fecal output of 12 dogs that ate one of three types of dog food: fresh, human-grade or extruded (kibble). The researchers found that the dogs that were fed fresh and human-grade food excreted about half as much as those that were fed classic, processed dog food. The human-grade foods were also found to be extremely digestible, and the dogs that ate them had to eat less food to maintain the same weight. There were many differences in fecal microbiota among the three diets, and the scientists stated that this was likely because of differences in ingredient source, nutrient concentrations and processing methods.

Stressed college students might benefit by adding walnuts to their diet before their next exam. A randomized clinical trial published in the journal Nutrients sought to investigate the effects of academic stress and daily walnut consumption on mental health, general well-being and gut microbiota in a group of 80 college students. Walnuts are full of nutrients that support brain and gut health, including omega-3 fatty acids, antioxidants, melatonin (sleep-inducing hormone), polyphenols, folate and vitamin E.

The University of South Australia researchers concluded that daily consumption of one half cup of walnuts improved self-reported mood and mental health status, metabolic biomarkers and sleep quality. The data also suggested that walnuts might counteract the negative effects of academic stress on the gut microbiota in women. The scientists noted that more research was needed with respect to males, as far fewer men participated in this study. They also cautioned that the placebo effect could have influenced results, as this was not a blind study.